API Docs for: 1.10.1 最后更新日期：2016年03月28日
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File: transitions/LEasing.js

/** @language chinese
 * <p>LTweenLite的各种效果。</p>
 * <p><img src="../../../api/LEasing/None.png" /></p>
 * <p><img src="../../../api/LEasing/Quad.png" /></p>
 * <p><img src="../../../api/LEasing/Cubic.png" /></p>
 * <p><img src="../../../api/LEasing/Quart.png" /></p>
 * <p><img src="../../../api/LEasing/Quint.png" /></p>
 * <p><img src="../../../api/LEasing/Sine.png" /></p>
 * <p><img src="../../../api/LEasing/Strong.png" /></p>
 * <p><img src="../../../api/LEasing/Expo.png" /></p>
 * <p><img src="../../../api/LEasing/Circ.png" /></p>
 * <p><img src="../../../api/LEasing/Elastic.png" /></p>
 * <p><img src="../../../api/LEasing/Back.png" /></p>
 * <p><img src="../../../api/LEasing/Bounce.png" /></p>
 * @class LEasing
 * @constructor
 * @since 1.4.0
 * @examplelink <p><a href="../../../api/LEasing/index.html" target="_blank">测试链接</a></p>
 * @public
 */
var LEasing = {
	None : {
		easeIn : function (t, b, c, d) {
			return b + t * c / d;
		},
		easeOut : function (t, b, c, d) {
			return b + t * c / d;
		},
		easeInOut : function (t, b, c, d) {
			return b + t * c / d;
		}
	},
	Quad : {
		easeIn : function (t, b, c, d) {
			return c * (t /= d) * t + b;
		},
		easeOut : function (t, b, c, d) {
			return -c * (t /= d) * (t - 2) + b;
		},
		easeInOut : function (t, b, c, d) {
			if ((t /= d / 2) < 1) {
				return c / 2 * t * t + b;
			}
			return -c / 2 * ((--t) * (t - 2) - 1) + b;
		}
	},
	Cubic : {
		easeIn : function (t, b, c, d) {
			return c * (t /= d) * t * t + b;
		},
		easeOut : function (t, b, c, d) {
			return c * ((t = t / d - 1) * t * t + 1) + b;
		},
		easeInOut : function (t, b, c, d) {
			if ((t /= d / 2) < 1) {
				return c / 2 * t * t * t + b;
			}
			return c / 2 * ((t -= 2) * t * t + 2) + b;
		}
	},
	Quart : {
		easeIn : function (t, b, c, d) {
			return c * (t /= d) * t * t * t + b;
		},
		easeOut : function (t, b, c, d) {
			return -c * ((t = t / d - 1) * t * t * t - 1) + b;
		},
		easeInOut : function (t, b, c, d) {
			if ((t /= d / 2) < 1) {
				return c / 2 * t * t * t * t + b;
			}
			return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
		}
	},
	Quint : {
		easeIn : function (t, b, c, d) {
			return c * (t /= d) * t * t * t * t + b;
		},
		easeOut : function (t, b, c, d) {
			return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
		},
		easeInOut : function (t, b, c, d) {
			if ((t /= d / 2) < 1) {
				return c / 2 * t * t * t * t * t + b;
			}
			return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
		}
	},
	Sine : {
		easeIn : function (t, b, c, d) {
			return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
		},
		easeOut : function (t, b, c, d) {
			return c * Math.sin(t / d * (Math.PI / 2)) + b;
		},
		easeInOut : function (t, b, c, d) {
			return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
		}
	},
	Strong : {
		easeIn : function (t, b, c, d) {
			return c * (t /= d) * t * t * t * t + b;
		},
		easeOut : function (t, b, c, d) {
			return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
		},
		easeInOut : function (t, b, c, d) {
			if ((t /= d / 2) < 1) {
				return c / 2 * t * t * t * t * t + b;
			}
			return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
		}
	},
	Expo : {
		easeIn : function (t, b, c, d) {
			return (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
		},
		easeOut : function (t, b, c, d) {
			return (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
		},
		easeInOut : function (t, b, c, d) {
			if (t == 0) {
				return b;
			}
			if (t == d) {
				return b + c;
			}
			if ((t /= d / 2) < 1) {
				return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
			}
			return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
		}
	},
	Circ : {
		easeIn : function (t, b, c, d) {
			return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
		},
		easeOut : function (t, b, c, d) {
			return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
		},
		easeInOut : function (t, b, c, d) {
			if ((t /= d / 2) < 1) {
				return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
			}
			return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
		}
	},
	Elastic : {
		easeIn : function (t, b, c, d, a, p) {
			var s;
			if (t == 0) {
				return b;
			}
			if ((t /= d) == 1) {
				return b + c;
			}
			if (!p) {
				p = d * .3;
			}
			if (!a || a < Math.abs(c)) {
				a = c;
				s = p / 4;
			} else {
				s = p / (2 * Math.PI) * Math.asin(c / a);
			}
			return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
		},
		easeOut : function (t, b, c, d, a, p) {
			var s;
			if (t == 0) {
				return b;
			}
			if ((t /= d) == 1) {
				return b + c;
			}
			if (!p) {
				p = d * .3;
			}
			if (!a || a < Math.abs(c)) {
				a = c;
				s = p / 4;
			} else {
				s = p / (2 * Math.PI) * Math.asin(c / a);
			}
			return (a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b);
		},
		easeInOut : function (t, b, c, d, a, p) {
			var s;
			if (t == 0) {
				return b;
			}
			if ((t /= d / 2) == 2) {
				return b + c;
			}
			if (!p) {
				p = d * (.3 * 1.5);
			}
			if (!a || a < Math.abs(c)) {
				a = c;
				s = p / 4;
			} else {
				s = p / (2 * Math.PI) * Math.asin(c / a);
			}
			if (t < 1) {
				return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
			}
			return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
		}
	},
	Back : {
		easeIn : function (t, b, c, d, s) {
			if (typeof s == UNDEFINED) {
				s = 1.70158;
			}
			return c * (t /= d) * t * ((s + 1) * t - s) + b;
		},
		easeOut : function (t, b, c, d, s) {
			if (typeof s == UNDEFINED) {
				s = 1.70158;
			}
			return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
		},
		easeInOut : function (t, b, c, d, s) {
			if (typeof s == UNDEFINED) {
				s = 1.70158;
			} 
			if ((t /= d / 2) < 1) {
				return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
			}
			return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
		}
	},
	Bounce : {
		easeIn : function (t, b, c, d) {
			return c - LEasing.Bounce.easeOut(d - t, 0, c, d) + b;
		},
		easeOut : function (t, b, c, d) {
			if ((t /= d) < (1 / 2.75)) {
				return c * (7.5625 * t * t) + b;
			} else if (t < (2 / 2.75)) {
				return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
			} else if (t < (2.5 / 2.75)) {
				return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
			} else {
				return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
			}
		},
		easeInOut : function (t, b, c, d) {
			if (t < d / 2) {
				return LEasing.Bounce.easeIn(t * 2, 0, c, d) * .5 + b;
			}
			return LEasing.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
		}
	}
};
var Quad = LEasing.Quad,
Cubic = LEasing.Cubic,
Quart = LEasing.Quart,
Quint = LEasing.Quint,
Sine = LEasing.Sine,
Strong = LEasing.Strong,
Expo = LEasing.Expo,
Circ = LEasing.Circ,
Elastic = LEasing.Elastic,
Back = LEasing.Back,
Bounce = LEasing.Bounce;